While no further details have been released about Spader's role, this newest development still pleases us to no end. James Spader is the perfect choice for Ultron, a cold, calculating android hellbent on destroying the human race, for a number of reasons. But before we get into the future of "Avengers," let's first take a look at its past—specifically the recently concluded "Avengers: Earth's Mightiest Heroes" animated TV series!

Series Statistics

Network: Disney XD

Broadcast Date: 2010 - 2013

Seasons: 2

Episodes: 52

Based on a 20-part micro-series, "The Avengers: Earth's Mightiest Heroes" features an all-star cast of Marvel superheroes and is based on legendary comic books written by Stan Lee himself and also more recent comic book events like "Secret Invasion." In its first season, the Avengers sports a veritable who's who of crime-fighters: Iron Man, Giant Man, Captain America, Hulk, Thor, Black Panther, Hawkeye, and the Wasp.

Despite the fact that the series is technically for children, "Avengers: EMH" has garnered mostly positive reviews from critics and fans alike since its premiere. The series' second and final season saw Carol Danvers join the team full-time as Ms. Marvel and ramped up the stakes, making for a fitting conclusion.

Notable Episodes

Some Assembly Required

Based on issue #2 of the original Avengers series, this episode revolves around the newly formed Avengers as they're settling into their new home—Avengers Mansion. However, the Hulk soon becomes brainwashed by the Enchantress and Earth's Mightiest Heroes must band together to stop him.

Masters of Evil

Guest starring the villainous Wonder Man, Enchantress, Executioner, Crimson Dynamo and the Abomination, Baron Zemo forms his own superpowerful team of super villains in order to combat the mighty Avengers.

Secret Invasion

Based on the Marvel event comic of the same name, the Avengers find themselves at odds when it's revealed that not everyone on the team is who they claim to be. With the Skrulls planting several moles on Earth, the heroes must overcome their distrust in one another to save our planet from the shape-shifting aliens.

New Avengers

After Kang the Conqueror traps the original Avengers team in a temporal void, Spider-Man, War Machine, Wolverine, Luke Cage, Iron Fist, and the Thing dub themselves the "New Avengers" and set out to protect the world from Kang's nefarious plans.

The Ultron Imperative

Taking place almost directly after the first Ultron attack, Ultron-6 has transcended his physical body and has begun taking over the world's technology systems—including nuclear missile launchers. The Avengers must quickly overcome the death of their fallen ally if they want to prevent Ultron from annihilating all of humanity.

Still not convinced that "The Avengers: Earth's Mightiest Heroes" isn't just for kids? Well, check out this clip of Captain America, Hawkeye, Black Panther, Johnny Storm, the Thing, and the Hulk playing a very mature game of poker: